It's always found with the spellbook ability, and it allows the player to generate a card into their hand from a selection of three cards that weren't originally present in that player's deck
Unfortunately its power was such that it proved to be too much for Pauper and was banned
$0.49 Donatello, Gadget Master Teenage Mutant Ninja Turtles $5.99 Raph & Mikey, Troublemakers Teenage Mutant Ninja Turtles $2.99 Michelangelo, Improviser Teenage Mutant Ninja Turtles $0.79 Leader's Talent Teenage Mutant Ninja Turtles $3.99 Michelangelo, Weirdness to 11 Teenage Mutant Ninja Turtles $0.49 Don & Raph, Hard Science Teenage Mutant Ninja Turtles $0.49 Don & Leo, Problem Solvers Teenage Mutant Ninja Turtles $1.99 Mutagen Man, Living Ooze Teenage Mutant Ninja Turtles $1.99 Mikey & Leo, Chaos & Order Teenage Mutant Ninja Turtles $0.49 Turtles Forever Teenage Mutant Ninja Turtles $0.49 Splinter, Radical Rat Teenage Mutant Ninja Turtles $0.99 Raphael, the Nightwatcher Teenage Mutant Ninja Turtles 0 results found
It's huge and splashy, and can cause some incredible moments in a game, but is held back from being overpowered by the high mana cost and need for your commander to be just as pricy for maximum impact
Looking at the top card is an extremely powerful effect, and there are 74 Dragons available in Simic without even getting into Changelings and the like